[hsn915]

It doesn't. These societies are permanently changed because of immigrations. This of course works fine for the immigrants (like myself!) but if I was a Canadian in the 70s I would be greatly opposed to this movement.

I'm not Japanese, but in objectively thinking about what's best for Japan, "immigration" is not on the list. In fact it's on the list of things to never ever do. I don't mean it as in "do not accept foreigners". I mean do not adopt the policy of mass immigration to offset the shrinking population.